Solar electric array :  8 Astropower AP120, 120-watt, 12-VDC modules  (0.96 peak kW total) :  1 Solar Boost SB50, 50-amp MPPT charge controllers :  24 Surrette 12-VDC, 200-ahr T-12-250 batteries  (58 kWh storage) :  1 Xantrex SW4024 inverter :  1 Outback Power PSDC control board Installing the solar electric array Xantrex 4024 inverter and control board